Graphics issue even after MLB change (colorful line on boot up)
My Mac suddenly faced a graphics issue after a week of RAM upgrade from 4 to 16 gb(CRUCIAL memory made for Mac) and it crashed. I took my Mac for repair to apple centre and they changed MBP’s MLB twice under the quality program as it was a manufacturing defect as per them. Also, as per APPLE test the Samsung SSD I have installed shows a SMART test failure (although no such failure is indicated by Disk utility or third party application). To remove this apprehension I sent the SSD to samsung for repair and as per Samsung there was no fault in the SSD. Even now the test is failed, that might be because MBP 2011 officially do not support SSD.
Since then everything is working fine except a colorful line(attached) that comes while reboot (this came especially after PRAM reset that I performed after my MacBook was repaired. Its been more than 2 months that these lines show up ( picture attached), however, the Mac is working just fine. I get a boot time of not more than 20 seconds. Graphics otherwise with movies etc work fine.
I want to know whether such line is normal or an abnormality as no one at apple seem to know about this issue accurately. I would appreciate a reply from you.
this is the image of the issue
Is this a good question?